This isn't the most technical of questions...

I was able to grab a new set of power pulleys off eBay for next to nothing, so I thought I'd take a chance and see if they do anything for my 5-spd '88 Formula (which I'll also be autocrossing).

I need the four bolts that hold the one pulley onto the harmonic balancer. I can't use the factory bolts as the pulley diameter is smaller and the regular bolts won't fit.

What the heck is this style of bolt referred to as? An Allen wrench is used on them, but does this style of bolt have a proper name? The big box hardware stores around here don't carry metric bolts like these.

This is an image that was originally posted by Arn. Those are the four bolts that I need. What are they called... so that I can find some like them?

[This message has been edited by Patrick (edited 04-19-2014).]

Hex head bolts.

quote Originally posted by hiwil88formula: Hex head bolts.

But look what comes up in a search...



Most of those examples are not what I want. Is there a term that narrows it down more?

http://www.amazon.com/Stain...id=1397891508&sr=1-8

Maybe this will help more.

Well, as luck would have it, I think I have the exact same pulley sitting in a box in the basement w/ the bolts.
Bolt type: Socket Cap
Grade: 8
Length: 1 1/4"
Threads: 18
Drive size: 5/16" or M8
Thread Type: Coarse

Looks very very similar to this:
https://www.boltdepot.com/P...ls.aspx?product=5037

You'll also need the smaller belt to go with it. Mine used a Gates Micro-V K050385

------------------
-Chris
'85 V6 SE 4sp (SOLD)
'88 GT - Series 3 SC3800 w/ 3.5" pulley, 1.8" rockers, 3" exhaust, 3.5" intake, 3.29 gearing. Installed and tuned by Sinister Performance
'99 Kawasaki Vulcan 500, owned since new
'03 Sentra SE-R Spec V (Prepping to sell)
'09 G37x Sedan w/ Premium & Nav (wife's car)
'13 G37xS Sedan (new daily driver)

Socket Head bolt or Socket Head cap screw

Fuller Metric
http://www.fullermetric.com...ts/socket/index.aspx

B.C. Fasteners
http://www.bcf2000.ca/

FABORY
http://www.fabory.com/en/ca...Id=fabory_0000092195


------------------
Calgary time/temp

3.4L Supercharged 87 GT Click me
Super Duty 4 Indy #163 Click me

[This message has been edited by fierosound (edited 04-19-2014).]

If those links don't help you, I find Mcmaster Carr very helpful even if you don't buy from there, the ease of finding what you need/identify is awesome

http://www.mcmaster.com/#screws/=rlpkva

Allen head bolts. VWs and Audis are littered with them. Go to any junk yard and get any size you need of a VW.. PS: On a VW the heads are all METRIC. and the popular sizes are 5mm and 7mm.

Cheers!

They're commonly called Allen head bolts or socket head cap screws.

Hey guys, thanks very much for the links to all those sites with examples of these bolts. Much appreciated.

quote Originally posted by Purple86GT: Allen head bolts. VWs and Audis are littered with them. Go to any junk yard and get any size you need of a VW.. PS: On a VW the heads are all METRIC. and the popular sizes are 5mm and 7mm.

Being the thifty guy I am, I like the sound of that. Always looking for an excuse to poke around the wrecking yards!

quote Originally posted by Chris_narf: You'll also need the smaller belt to go with it. Mine used a Gates Micro-V K050385

Fitting a belt for mine is a bit complicated, as not only will I be using a smaller crank pulley and a larger alternator pulley... but I've also got Dodgerunner's auto-tensioner installed. The belt that's normally used with his tensioner is a K050450 (45"). As near as I can determine (using a wire for measuring), I'll now need a K050420 (42") belt.

To give all of you from the States an idea of how much Canadians get ripped off with auto parts prices here, the belt I need at Lordco (a large auto parts supply company) lists at $38.89. With their car club "discount", the belt can be bought there for $27.22, plus 12% tax. So I checked out eBay. Glad I did. I bought a nice new Goodyear Gatorback belt for $5.60... which included shipping!

[This message has been edited by Patrick (edited 04-19-2014).]